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There are two bars of gold-silver alloy; The first is 40% [#permalink]
12 Mar 2008, 10:20

There are two bars of gold-silver alloy; The first is 40% gold and 60% silver,the second is 30% gold and 79% silver. If both bars are melted into an 8 kg.bar that is 5 parts gold and 11 parts silver, what was the weight in kilograms ofthe first bar?